EP1847238B1 - Femurprothese - Google Patents

Femurprothese Download PDF

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Publication number
EP1847238B1
EP1847238B1 EP06121315A EP06121315A EP1847238B1 EP 1847238 B1 EP1847238 B1 EP 1847238B1 EP 06121315 A EP06121315 A EP 06121315A EP 06121315 A EP06121315 A EP 06121315A EP 1847238 B1 EP1847238 B1 EP 1847238B1
Authority
EP
European Patent Office
Prior art keywords
prosthesis
femoral prosthesis
shaped stem
fins
bone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06121315A
Other languages
English (en)
French (fr)
Other versions
EP1847238A1 (de
Inventor
Giorgio Curradini
Stefano Lanfranco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plus Orthopedics Italy SRL
Original Assignee
Plus Orthopedics Italy SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP1847238A1 publication Critical patent/EP1847238A1/de
Application granted granted Critical
Publication of EP1847238B1 publication Critical patent/EP1847238B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30156—Convex polygonal shapes triangular
    • A—HUMAN NECESSITIES
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    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30159—Concave polygonal shapes
    • A61F2002/30171—Concave polygonal shapes rosette- or star-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • A—HUMAN NECESSITIES
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    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/005—Rosette-shaped, e.g. star-shaped

Definitions

  • the present invention relates to a prosthesis particularly suitable for implantation in the femur.
  • Such degeneration can cause pain and restrict motion, making the person inclined to limp and have difficulty moving the lower limb.
  • the solution to these problems lies in replacing the bone joint with an artificial joint consisting of a prosthesis implanted in lieu of the head of the femur and forming a mobile articulation with an acetabular unit attached to the acetabulum.
  • the femoral prostheses of known type typically have a shaped stem that fits into a corresponding canal created in the femur.
  • the former are attached to the femur with the aid of a filler, adhesive or cement, while the latter are shaped so as to facilitate bone regrowth and its consequent attachment.
  • the prosthesis is made with a surface shape designed to guarantee an initial stability of the prosthesis inside the femur when it is loaded (primary stability), giving the bone time to grow back and become permanently attached to the prosthesis (secondary stability).
  • the prostheses of known type have differently-shaped cross-sections, among them (especially for femoral implants) are the prostheses with a circular cross-section.
  • this has the advantage of enabling the orientation of the prosthesis inside the femoral canal to be adjusted even after said canal has been prepared, thus ensuring a greater intra operative flexibility than prostheses with an asymmetrical cross-section.
  • Prostheses with a circular cross-section must be provided, however, with a plurality of torsion-resistant fins projecting from the lateral surface of the stem that generate a plurality of corresponding grooves in the bone, which thus oppose the rotational movement to which the prosthesis is submitted when the joint in use.
  • the first of these drawbacks lies in that, despite the presence of the torsion-resistant fins, the regrowing bone does not always bond adequately with the prosthesis, in which case the latter has to be replaced.
  • the torsion-resistant fins are not sufficient to contrast the rotational stress at the femur-prosthesis interface, allowing the prosthesis to move inside the bone and consequently preventing the bone's regrowth.
  • the object of the present invention is to overcome the aforementioned drawbacks.
  • a first object of the present invention is to produce a femoral prosthesis with a substantially circular, symmetrical cross-section that facilitates the bonding of the regrowing bone to the prosthesis better than equivalent prostheses of the known state of the art.
  • Another object of the present invention is to produce a femoral prosthesis that affords a greater resistance to torsional stress than equivalent prostheses belonging to the known state of the art.
  • a further advantage lies in that the number of said ridges can be increased by increasing the number of straight portions coming between each pair of fins.
  • said ridges advantageously generate seats and thereby further contrast the torsional stress coming to bear on the prosthesis-femur interface.
  • the connecting portions between the straight portions and the adjacent fins advantageously increase the surface area of contact between the bone and the prosthesis by comparison with equivalent prostheses of the known state of the art.
  • the femoral prosthesis forming the object of the invention is illustrated in figures 1 and 2 , where it is globally indicated by the numeral 1 and where it can be seen to comprise at least one stem 2 with a substantially truncated cone shape, the lateral surface 3 of which is shaped into a plurality of torsion-resistant fins 4 running in the longitudinal direction X along said shaped stem 2.
  • the femoral prosthesis 1 also comprises an appendage 5 projecting from the top base 6 of the shaped stem 2 designed to support a spherical element 7a that forms an articulation with an acetabular element 7b associated with the acetabulum A of the user.
  • the peripheral portion 10 of any cross-section of the shaped stem 2, coming between any pair of adjacent fins 4, comprises at least one substantially straight portion 11 connected to at least one of the fins 4 by means of a recessed connecting portion 13, i.e. that forms a groove in the shaped stem 2 and that, together with said straight portion 11, forms a ridge 12.
  • This configuration advantageously gives rise to a plurality of ridges generated along the longitudinal axis X of the shaped stem 2, which stimulate the bone ingrowth of the femoral bone F around prosthesis 1.
  • the recessed configuration of said connecting portion 13 advantageously enables an increase in the contact surface area at the interface between the bone F and the prosthesis 1, thereby improving the stability of the latter by comparison with equivalent prostheses of known type.
  • peripheral portion 110 comprises two or more substantially straight portions 111, which, between them, form at least one additional ridge 114, as illustrated in fig. 4 .
  • said ridges may be connected together by curved portions 216 that are preferably recessed towards the inside of the shaped stem 202, here again to enable an increase in the surface area of contact between the bone F and the prosthesis 200.
  • all the straight portions 11 clearly have a point of tangency 20 on the same circumference 21 and, to be more precise, said point of tangency 20 is the midpoint along the corresponding straight portion 11.
  • this preferably comprises at least one curved part 23 that, as previously mentioned, enables an increase in the contact surface area between the bone F and the prosthesis 1.
  • the curved part 23 is convex, or recessed, towards the inside of the shaped stem 2, although this is not intended to restrict any other embodiments wherein the second connecting portion may not necessarily include a curved part, but form a mixtilinear connection that is nonetheless recessed towards the inside of said shaped stem.
  • the fins 4 preferably, but not necessarily, have a cross-section in the shape of a triangle.
  • the sloping sides of the triangle may be straight or curved, with their convexity facing towards the inside of the triangle to accentuate their torsion-resistant characteristic.
  • the shape of the fins' cross-section may differ in other embodiments (not illustrated herein) and may, for instance, be quadrilateral.
  • the surgeon cuts the head of the femur and prepares a circular seat therein.
  • the femoral prosthesis 1 of the invention is inserted in said seat, oriented at a suitable angle.
  • the fins 4 and ridges 12 dig into the sides of said seat, creating corresponding grooves in which they exert their torsion-resistant effect.
  • the appendage 5 is inserted in the ball-shaped element 7a, which forms an articulated joint in association with the acetabular unit 7b in the acetabulum.
  • the fins 4 and ridges 12 ensure that the prosthesis 1 remains sufficiently stable, enabling the regrowth of the bone F, which becomes coupled to the prosthesis 1.
  • the femoral prosthesis of the invention achieves all the previously-stated objects.
  • the femoral prosthesis of the invention achieves the object of facilitating the adhesion of the bone to the prosthesis by comparison with equivalent prostheses belonging to the known state of the art thanks to the presence on its lateral surface of a plurality of ridges that, as explained earlier, accentuate the capacity for the bone to adhere to the prosthesis.
  • the femoral prosthesis of the invention may undergo further additions or variations that will also be covered by the present patent if they come within the scope of the claims that follow, even if they are not illustrated or described herein.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)

Claims (9)

  1. Oberschenkelprothese (1; 100; 200), umfassend:
    - einen geformten Schaft (2; 102; 202) mit einer im Wesentlichen kegelstumpfförmigen Form; und
    - eine Vielzahl an torsionsbeständigen Rippen (4), die von der Seitenoberfläche (3) des geformten Schafts (2; 102; 202) vorstehen und sich in Längsrichtung (X) entlang dem geformten Schaft (2; 102; 202) erstrecken;
    wobei der Umfangsrandabschnitt (10; 110; 210) eines jeden Querschnitts des geformten Schafts (2; 102; 202), der zwischen jedem benachbarten Paar aus Rippen (4) vorhanden ist, zumindest einen im Wesentlichen geraden Abschnitt (11; 111; 211) umfasst, dadurch gekennzeichnet, dass der gerade Abschnitt (11; 111; 211) über einen Verbindungsabschnitt (13), der zum Inneren des geformten Schafts (2; 102; 202) hin vertieft ist, mit zumindest einer der Rippen (4) verbunden ist, wobei der Verbindungsabschnitt (13) dadurch in Bezug auf den geraden Abschnitt (11; 111; 211) eine Kante (12) definiert.
  2. Oberschenkelprothese (100; 200) nach Anspruch 1), dadurch gekennzeichnet, dass der Umfangsrandabschnitt (110; 210) zumindest zwei im Wesentlichen gerade Abschnitte (111; 211) umfasst, die zumindest eine Kante (114; 215) zwischen sich definieren.
  3. Oberschenkelprothese (200) nach Anspruch 2), dadurch gekennzeichnet, dass zwei oder mehr zusätzliche Kanten (215) zwischen den zumindest zwei im Wesentlichen geraden Abschnitten (211) vorhanden sind, die durch gebogene Abschnitte (216), die zum Inneren des geformten Schafts (202) hin vertieft sind, miteinander verbunden sind.
  4. Oberschenkelprothese (1; 100; 200) nach Anspruch 1), dadurch gekennzeichnet, dass alle geraden Abschnitte (11; 111; 211) einen Tangentenpunkt (20) am gleichen Umfang (21) aufweisen.
  5. Oberschenkelprothese (1; 100; 200) nach Anspruch 4), dadurch gekennzeichnet, dass der Tangentenpunkt (20) der Mittelpunkt entlang dem entsprechenden geraden Abschnitt (11; 111; 211) ist.
  6. Oberschenkelprothese (1; 100; 200) nach Anspruch 1), dadurch gekennzeichnet, dass der Verbindungsabschnitt (13) zumindest einen gebogenen Teil (23) umfasst.
  7. Oberschenkelprothese (1; 100; 200) nach Anspruch 3) oder 6),
    dadurch gekennzeichnet, dass der gebogene Teil (23; 216) konvexe Oberflächen aufweist, die zum Inneren des geformten Schafts (2; 102; 202) hin vertieft sind.
  8. Oberschenkelprothese (1; 100; 200) nach Anspruch 1), dadurch gekennzeichnet, dass die Rippen (4) einen Querschnitt von im Wesentlichen dreieckiger Form aufweisen.
  9. Oberschenkelprothese (1; 100; 200) nach Anspruch 1), dadurch gekennzeichnet, dass die schrägen Seiten des Dreiecks gebogen sind.
EP06121315A 2006-04-18 2006-09-27 Femurprothese Not-in-force EP1847238B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000115A ITVI20060115A1 (it) 2006-04-18 2006-04-18 Protesi femorale

Publications (2)

Publication Number Publication Date
EP1847238A1 EP1847238A1 (de) 2007-10-24
EP1847238B1 true EP1847238B1 (de) 2009-09-09

Family

ID=38145521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121315A Not-in-force EP1847238B1 (de) 2006-04-18 2006-09-27 Femurprothese

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Country Link
EP (1) EP1847238B1 (de)
AT (1) ATE442109T1 (de)
DE (1) DE602006009073D1 (de)
IT (1) ITVI20060115A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023006566A1 (de) * 2021-07-28 2023-02-02 mechamed GmbH Fixiermittel für eine prothese

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996625A (en) * 1975-02-28 1976-12-14 United States Surgical Corporation Artificial hip joint with novel stem
DE9401529U1 (de) * 1994-01-26 1994-05-11 Artos Med Produkte Oberschenkelteil für eine Hüftgelenk-Endoprothese
IT1271759B (it) 1994-03-17 1997-06-09 Cremascoli Srl G Protesi femorale particolarmente studiata per la revisione di impianti protesici che hanno avuto esito negativo
CH688539A5 (de) * 1994-04-19 1997-11-14 Werner Hermann Femurprothese.
CA2225375A1 (en) * 1996-12-23 1998-06-23 Mark Manasas Alignment guide for insertion of fluted or keyed orthopedic components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023006566A1 (de) * 2021-07-28 2023-02-02 mechamed GmbH Fixiermittel für eine prothese

Also Published As

Publication number Publication date
DE602006009073D1 (de) 2009-10-22
EP1847238A1 (de) 2007-10-24
ITVI20060115A1 (it) 2007-10-19
ATE442109T1 (de) 2009-09-15

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